<!doctype html>
<html>
    <head>
        <title>bar chart</title>
        <meta charset="utf-8" />
        <style>
         .bar {
             fill: steelblue;
         }

         .bar:hover {
             fill: brown;
         }

         .axis text {
             font: 10px sans-serif;
         }

         .axis path,
         .axis line {
             fill: none;
             stroke: #000;
             shape-rendering: crispEdges;
         }
         
         .x.axis path {
             display: none;
         }
         
        </style>
    </head>
    <body>
        <script src="../d3.js"></script>
        <script>

         var margin = {top: 20, right: 20, bottom: 30, left: 40},
         width = 960 - margin.left - margin.right,
         height = 500 - margin.top - margin.bottom;

         var x = d3.scale.ordinal()
                         .rangeRoundBands([0, width], .1);

         var y = d3.scale.linear()
                         .range([height, 0]);

         var xAxis = d3.svg.axis()
                           .scale(x)
                           .orient("bottom");

         var yAxis = d3.svg.axis()
                           .scale(y)
                           .orient("left")
                           .ticks(10, "%");

         var svg = d3.select("body").append("svg")
                     .attr("width", width + margin.left + margin.right)
                     .attr("height", height + margin.top + margin.bottom)
                     .append("g")
                     .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

         d3.tsv("bar3.tsv", type, function(error, data) {
             x.domain(data.map(function(d) { return d.letter; }));
             y.domain([0, d3.max(data, function(d) { return d.value; })]);

             svg.append("g")
                .attr("class", "x axis")
                .attr("transform", "translate(0," + height + ")")
                .call(xAxis);

             svg.append("g")
                .attr("class", "y axis")
                .call(yAxis)
                .append("text")
                .attr("transform", "rotate(-90)")
                .attr("y", 6)
                .attr("dy", ".71em")
                .style("text-anchor", "end")
                .text("Frequency");

             svg.selectAll(".bar")
                .data(data)
                .enter().append("rect")
                .attr("class", "bar")
                .attr("x", function(d) { return x(d.letter); })
                .attr("width", x.rangeBand())
                .attr("y", function(d) { return y(d.value); })
                .attr("height", function(d) { return height - y(d.value); });

         });

         function type(d) {
             d.value = +d.value;
             return d;
         }

        </script>
    </body>
</html>
